English verb conjugation
MUST RUN

Irregular verb: run - ran - run

Affirmation

Simple form	V-ing form
I must run you must run she must run we must run you must run they must run	I must be running you must be running she must be running we must be running you must be running they must be running
Perfect	V-ing perfect
I must have run you must have run she must have run we must have run you must have run they must have run	I must have been running you must have been running she must have been running we must have been running you must have been running they must have been running

Negation

Simple form	V-ing form
I must not run you must not run she must not run we must not run you must not run they must not run	I must not be running you must not be running she must not be running we must not be running you must not be running they must not be running
Perfect	V-ing perfect
I must not have run you must not have run she must not have run we must not have run you must not have run they must not have run	I must not have been running you must not have been running she must not have been running we must not have been running you must not have been running they must not have been running

Interrogative form

Simple form	V-ing form
must I run? must you run? must she run? must we run? must you run? must they run?	must I be running? must you be running? must she be running? must we be running? must you be running? must they be running?
Perfect	V-ing perfect
must I have run? must you have run? must she have run? must we have run? must you have run? must they have run?	must I have been running? must you have been running? must she have been running? must we have been running? must you have been running? must they have been running?

Interro-negative form

Simple form	V-ing form
must I not run? must you not run? must she not run? must we not run? must you not run? must they not run?	must I not be running? must you not be running? must she not be running? must we not be running? must you not be running? must they not be running?
Perfect	V-ing perfect
must I not have run? must you not have run? must she not have run? must we not have run? must you not have run? must they not have run?	must I not have been running? must you not have been running? must she not have been running? must we not have been running? must you not have been running? must they not have been running?